A 5-week-old typically eats 4 to 5 ounces per feeding, about six to eight times per day. That works out to roughly 24 to 32 ounces total in a 24-hour period, though every baby is a little different. The right amount for your baby depends on their weight, hunger cues, and whether they’re breastfed or formula-fed.
How Much Per Feeding
Between 1 and 2 months of age, most babies take in 4 to 5 ounces at each feeding session. That lines up with a 5-week-old’s stomach capacity, which ranges from about 4 to 6 ounces. Pushing past that physical limit is one of the main triggers for spitting up, so bigger isn’t necessarily better. If your baby consistently drains a bottle and still seems hungry, it’s fine to offer another half-ounce or ounce, but there’s no need to top off a baby who’s turning away or falling asleep at the bottle.
Breastfed babies are harder to measure because you can’t see how much milk they’re transferring. A nursing session at 5 weeks typically lasts 10 to 20 minutes per breast, and most exclusively breastfed babies feed every 2 to 4 hours. The total daily intake is similar to formula-fed babies, but breastfed infants tend to eat smaller amounts more frequently rather than taking larger, spaced-out bottles.
How Often to Feed
At 5 weeks, expect to feed your baby six to eight times in a 24-hour period if they’re on formula, or closer to eight to twelve times if they’re breastfed. That can feel relentless, especially overnight. Spacing between feedings is usually two to four hours, measured from the start of one feeding to the start of the next.
Watch your baby rather than the clock. Hunger cues at this age include rooting (turning toward anything that touches their cheek), sucking on fists, smacking lips, and fussing. Crying is actually a late hunger signal. Feeding on demand, rather than on a rigid schedule, helps your baby regulate their own intake and supports steady weight gain.
The 6-Week Growth Spurt
Right around 4 to 6 weeks, many babies hit their first major growth spurt. You may notice your baby suddenly wanting to eat every hour or two, acting fussier than usual, waking more at night, or seeming unsatisfied after a feeding that would normally be enough. This pattern is called cluster feeding, and it’s especially common in breastfed babies during the evening hours.
A growth spurt typically lasts a few days, not weeks. During that window, it’s fine to feed more often. Your baby genuinely is hungrier. If you’re breastfeeding, the increased demand signals your body to produce more milk, so skipping or stretching out feedings during a growth spurt can work against your supply. If you’re formula-feeding, offering an extra ounce per bottle or adding a feeding or two per day is perfectly reasonable until the spurt passes.
Signs Your Baby Is Getting Enough
The simplest way to confirm your baby is eating well is to count diapers. After the first five days of life, a well-fed baby produces at least six wet diapers per day. The number of dirty diapers varies more, especially as babies get older, but consistent wet diapers are a reliable indicator of hydration.
Weight gain is the other key measure. Healthy babies at this age gain about 1½ to 2 pounds per month, or roughly 5 to 7 ounces per week. Your pediatrician tracks this at well-child visits, but if you’re concerned between appointments, many pediatric offices and lactation consultants offer drop-in weight checks. A baby who is gaining steadily, producing plenty of wet diapers, and seems content after most feedings is almost certainly getting enough.
Signs of Overfeeding
Overfeeding is more common with bottle-fed babies because the flow from a bottle nipple requires less effort than nursing, making it easy to take in more than the stomach can comfortably hold. The most obvious sign is frequent, forceful spitting up right after feeds. Some spit-up is normal at this age, but if your baby is regularly soaking through burp cloths and seems uncomfortable, the volume per feeding may be too high.
A baby who spits up but still acts happy, is gaining weight, and eagerly wants to eat again is likely fine. This is sometimes called a “happy spitter.” The concern shifts if spitting up is accompanied by poor weight gain, refusal to eat, or signs of pain. One helpful adjustment: offer smaller amounts more frequently rather than larger, less frequent bottles. Paced bottle feeding, where you hold the bottle more horizontally and take breaks during the feed, also helps babies regulate how much they take in.
Breastfed vs. Formula-Fed Differences
Total daily intake is roughly the same for both, but the patterns look different. Formula-fed babies tend to settle into a more predictable routine earlier, with feedings spaced further apart because formula digests more slowly than breast milk. A 5-week-old on formula might eat six times a day at 4 to 5 ounces each. A breastfed baby the same age might eat eight to twelve times, taking in slightly less at each session.
If you’re supplementing with both breast milk and formula, there’s no exact formula for splitting the amounts. The total daily volume stays in the same 24-to-32-ounce range. What matters most is that your baby is showing hunger and fullness cues you can follow, gaining weight on track, and producing enough wet diapers to confirm they’re well hydrated.